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Computer switching device, computer switching method therefor, program thereof and computer system thereofComputer switching device, computer switching method therefor, program thereof and computer system thereof description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060176293, Computer switching device, computer switching method therefor, program thereof and computer system thereof. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a computer switching device, a computer switching method therefor, a program and a computer system thereof, and more particularly to a computer switching device installed in a server room and so on. [0003] 2. Description of the Prior Art [0004] To reduce the installation space and cost of the device in the server room and so on, one keyboard, one mouse and one display are connected to a plurality of computers, employing a computer switching device called a KVM (Keyboard Video Mouse) switch (e.g., refer to Japanese Patent Laid-Open No. 2004-120441 and Japanese Patent Laid-Open No. 2003-345730). [0005] This computer switching device has a switch, for example, any computer is connected to the keyboard, mouse and display in accordance with an operation of the keyboard and mouse, enabling a plurality of computers to be operated by one keyboard, one mouse and one display. BRIEF SUMMARY OF THE INVENTION [0006] However, since the conventional computer switching device can not monitor the VGA (Video Graphics Array) outputs of the plurality of computers concurrently, the operator may overlook the error information occurring in an interval of switching the screens, when the plurality of computers run a job in parallel, resulting in a severe problem. [0007] That is, since the conventional computer switching device can not display the VGA outputs of the plurality of computers on a single display concurrently, the operator may often overlook the error, because all the screens can not be always monitored, even if an error and so on occurs in installing an OS (Operating System) or conducting various kinds of tests and so on, while multicasting the operation of keyboard and mouse for the plurality of computers. [0008] Also, the conventional computer switching device can not multicast the mouse operation effectively, because the initial position of mouse for each computer is often different in multicasting the mouse operation. [0009] Thus, it is an object of the invention to solve the above-mentioned problems, and to provide a computer switching device, a computer switching method, a program and a computer system in which a plurality of computers can be easily monitored for errors. [0010] The present invention provides a computer switching device for use in a computer system composed of a plurality of computers having a display output and needing each input of a keyboard and a mouse, comprising means of forming a display screen by synthesizing the display outputs of the plurality of computers, wherein the display outputs of the plurality of computers are displayed concurrently on the display screen by contracting and moving the display outputs on the display screen. [0011] Also, the invention provides a computer switching method for use with a computer switching device useful in a computer system composed of a plurality of computers having a display output and needing each input of a keyboard and a mouse, wherein [0012] the computer switching device performs a process of forming a display screen by synthesizing the display outputs of the plurality of computers, and the display outputs of the plurality of computers are displayed concurrently on the display screen by contracting and moving the display outputs on the display screen. [0013] Also, the invention provides a program for a computer switching method for use with a computer switching device useful in a computer system composed of a plurality of computers having a display output and needing each input of a keyboard and a mouse, wherein the program enables a computer to perform a process of forming a display screen by synthesizing the display outputs of the plurality of computers, and to display the display outputs of the plurality of computers concurrently on the display screen by contracting and moving the display outputs on the display screen. [0014] Further, the invention provides a computer system comprising a plurality of computers having a display output part, a keyboard input part and a mouse input part, a computer switching device for switching the input/output of the plurality of computers, and a display, a keyboard and a mouse connected to the computer switching device, wherein the computer switching device comprises a plurality of buffers for accumulating the output from the display output part of each of the plurality of computers, an image synthesis device for synthesizing the outputs from the plurality of buffers to be outputted onto the display, a keyboard connection switch for controlling the connection with the keyboard input part of each of the plurality of computers, a mouse connection switch for controlling the connection with the mouse input part of each of the plurality of computers, and a switching control device for controlling the keyboard connection switch based on the output from the keyboard and controlling the mouse connection switch based on the output from the mouse. [0015] That is, the computer switching device of the invention multicasts the operation information of one keyboard and mouse to any number of computers out of the plurality of computers connected to the self device, and displays the VGA (Video Graphics Array) outputs of the plurality of computers on a single display, easily operating and monitoring the plurality of computers. [0016] Also, the computer switching device of the invention has an initialization function of the mouse position, making the initial position of mouse in each computer to be operated identical, easily performing the mouse operation in multicasting. [0017] More specifically, the computer switching device of the invention comprises means of distributing the input operation information of keyboard over the plurality of computers in accordance with an instruction of the switching control device, means of distributing the input operation information of mouse over the plurality of computers in accordance with an instruction of the switching control device, means of buffering the VGA output of each computer, means of forming an image by synthesizing the VGA outputs of the computers in accordance with an instruction of the switching control device, and means of controlling the computer switching device. [0018] As described above, the computer switching device of the invention displays the VGA outputs of the plurality of computers on one display concurrently, easily monitoring the plurality of computers for errors. [0019] Also, the computer switching device of the invention changes the brightness of the screen between the computer to be multicast and another computer, easily discriminating the computer to be multicast. [0020] Moreover, the computer switching device of the invention can reset the mouse position, aligning the mouse positions of the plurality of computers, and easily performing the mouse operation by multicasting. BRIEF DESCRIPTION OF THE DRAWINGS [0021] FIG. 1 is a block diagram showing the configuration of a computer system according to one embodiment of the present invention; [0022] FIG. 2 is a view showing a switching control screen according to one embodiment of the present invention; Continue reading about Computer switching device, computer switching method therefor, program thereof and computer system thereof... 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